EP 0623227 B1 20000927 - LIQUID CRYSTAL LENS CIRCUIT
Title (en)
LIQUID CRYSTAL LENS CIRCUIT
Title (de)
SCHALTUNG FUR EINE FLUSSIGKRISTALLBLENDE
Title (fr)
CIRCUIT DE LENTILLE A CRISTAUX LIQUIDES
Publication
Application
Priority
- GB 9201124 A 19920120
- GB 9300119 W 19930120
Abstract (en)
[origin: WO9314435A1] A liquid crystal lens drive circuit for a pair of spectacles has user-controllable components (14, 21) which can be used to adjust the response time of the circuit to changes in ambient light and adjust the particular response of the circuit to excess light above a threshold in accordance with a desired response characteristic. Thus, momentary changes in the light level from the general ambient can be prevented from changing the optical density of the lenses unnecessarily and individual preferences as to the darkening characteristic can be accommodated in a standard pair of spectacles.
IPC 1-7
IPC 8 full level
G02C 7/10 (2006.01); G02F 1/133 (2006.01)
CPC (source: EP US)
G02C 7/101 (2013.01 - EP US); G02F 1/13306 (2013.01 - EP US)
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
WO 9314435 A1 19930722; AU 3360793 A 19930803; DE 69329491 D1 20001102; DE 69329491 T2 20010510; EP 0623227 A1 19941109; EP 0623227 B1 20000927; ES 2152944 T3 20010216; GB 9201124 D0 19920311; US 2002044112 A1 20020418; US 6433770 B1 20020813
DOCDB simple family (application)
GB 9300119 W 19930120; AU 3360793 A 19930120; DE 69329491 T 19930120; EP 93902418 A 19930120; ES 93902418 T 19930120; GB 9201124 A 19920120; US 25644494 A 19940712